﻿      //CharMode函数 
        //测试某个字符是属于哪一类. 
        function CharMode(iN){ 
            if (iN>=48 && iN <=57) //数字 
            return 1; 
            if (iN>=65 && iN <=90) //大写字母 
            return 2; 
            if (iN>=97 && iN <=122) //小写 
            return 4; 
            else 
            return 8; //特殊字符 
        } 

        //bitTotal函数 
        //计算出当前密码当中一共有多少种模式 
        function bitTotal(num){ 
            modes=0; 
            for (i=0;i<4;i++){ 
            if (num & 1) modes++; 
            num>>>=1; 
            } 
            return modes; 
        } 

        //checkStrong函数 
        //返回密码的强度级别 

        function checkStrong(sPW){ 
            if (sPW.length<=4) 
            return 0; //密码太短 
            Modes=0; 
            for (i=0;i<sPW.length;i++){ 
            //测试每一个字符的类别并统计一共有多少种模式. 
            Modes|=CharMode(sPW.charCodeAt(i)); 
        } 

        return bitTotal(Modes); 

        } 


    
     function pwStrength(pwd){ 
     
        O_color="#eeeeee"; 
        L_color="#FF0000"; 
        M_color="#FF9900"; 
        H_color="#33CC00"; 
        if (pwd==null||pwd==''){ 
          Lcolor=Mcolor=Hcolor=O_color; 
        } 
        else{ 
          S_level=checkStrong(pwd); 
          switch(S_level) { 
        case 0: 
        Lcolor=Mcolor=Hcolor=O_color;          
        case 1:         
        Lcolor=L_color; 
        Mcolor=Hcolor=O_color; 
        break; 
        case 2:     
        Lcolor=Mcolor=M_color; 
        Hcolor=O_color; 
        break; 
        default: 
        Lcolor=Mcolor=Hcolor=H_color; 
        } 
        } 

        document.getElementById("strength_L").style.background=Lcolor; 
        document.getElementById("strength_M").style.background=Mcolor; 
        document.getElementById("strength_H").style.background=Hcolor; 
        return; 
        }